Statistics-Test

1.   The marks obtained by 17 students in a mathematics test (out of 100) are given below:

        48, 66, 68, 49, 91, 72, 64, 46, 90, 79, 76, 82, 65, 96, 100, 82, 100

        Find the range of the data.

2.   The class-mark of the class 130 – 150 is:

3.   Calculate the median of : 152, 155, 160, 144, 145, 148, 147, 149, 150

4.   What is the median of 70, 40, 50, 100, 75, 75, 65 and 95?

5.   Form a frequency table for the following:

6.   If the mean of 8, 5, 2, x, 6, 5 is 6, then find the value of x.

7.   If the mean of the following data is 18.75, find the value of p:

7.   The mean of 40 numbers was found to be 35. Later on it was detected that a number 56 was misread as 16. Find the correct mean of the given numbers.

8.   A train travels between two stations x and y. While going from x to y, its average speed is 72 km per hour, and while coming back from y to x, its average speed is 63 km per hour. Find the average speed of the train during the whole journey.

9.   Find the mode for the following data using the relation : mode = (3 median – 2 mean)